The amount of wealth is irrelevant. You do not need a fancy calculator to keep a secret, or create a digital signature.
Just because a wealthy person can afford to buy expensive e-waste, doesn't mean they need it.
Phones are pretty secure these days. Apps are sandboxed. You can flash them with hardened firmware like GrapheneOS. You can use a dedicated phone as a wallet and never connect it to internet.
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A pixel also costs some money of course, but thanks for the feedback.
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